Answer:
0.33 g/mL
Step-by-step explanation:
The empty beaker weighs 123.45 g
20.00 mL of liquid was added to the beaker
The beaker + liquid weighs 130.05 g
So the liquid must weigh 130.05 g - 123.45 g = 6.60 g
We know the volume of liquid added was 20.00 mL
Density = Mass / Volume
Therefore, Density = 6.60 g / 20.00 mL = 0.33 g/mL
So the density of the liquid is 0.33 g/mL.